/*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkCodecAnimation_DEFINED
#define SkCodecAnimation_DEFINED

namespace SkCodecAnimation {
/* *
 * This specifies how the next frame is based on this frame.
 *
 * Names are based on the GIF 89a spec.
 *
 * The numbers correspond to values in a GIF.
 */
enum class DisposalMethod {
    /* *
     * The next frame should be drawn on top of this one.
     *
     * In a GIF, a value of 0 (not specified) is also treated as Keep.
     */
    kKeep = 1,

    /* *
     * Similar to Keep, except the area inside this frame's rectangle
     * should be cleared to the BackGround color (transparent) before
     * drawing the next frame.
     */
    kRestoreBGColor = 2,

    /* *
     * The next frame should be drawn on top of the previous frame - i.e.
     * disregarding this one.
     *
     * In a GIF, a value of 4 is also treated as RestorePrevious.
     */
    kRestorePrevious = 3,
};

/* *
 * How to blend the current frame.
 */
enum class Blend {
    /* *
     * Blend with the prior frame as if using SkBlendMode::kSrcOver.
     */
    kSrcOver,

    /* *
     * Blend with the prior frame as if using SkBlendMode::kSrc.
     *
     * This frame's pixels replace the destination pixels.
     */
    kSrc,
};
} // namespace SkCodecAnimation
#endif // SkCodecAnimation_DEFINED
